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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9c2a31564dadfd51d67e81f28cfaf9e7d26658a93b4552179b7aca1740dacc' 
  AND token = '74iQ221ZbAUO2nJt7WmgeCm5YVVuzyirWJmYQiOrMQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}